I use GrabCAD Workbench which I consider a great product for drawing management, if you have others on your team that collaborate on models / drawings, etc., or if you share files with others, like vendors, etc.. Yes, you can download your uploaded SW files as STEP files, but that requires you to create an account, to sync your local folders with the cloud and doing that conversion from the cloud. Might be worth doing if this is something one needed to often, or even semi-often. Note that it is not something you can do with the desktop app that downloads from Jeff's link. The desktop app is just to help facilitating the syncing with the cloud process.

EDIT: I just tried to download conversion on two simple SW parts on Workbench and both failed. I had never used this because I have not needed to but I just tried a couple simple sw parts and both failed. Obviously not a real option.

EDIT 2: I just did a test with downloading a SW assembly drawing as a STEP and it it did work. Go figure. I guess one's mileage going this route will vary.

SharkCAD Pro, a program that's now under the same ownership as TC, has translators for SW, CATIA 4 & 5, Pro/E, Solid Edge, NX and Parasolid. I needed some translation a few years ago and at the time, maybe 10-15 years back, IMSI was offering a translator for some of those in and out of TC - for USD1000. Ouch. Shark is a premium version of TC Mac that's also PC. Files exchange with TC Mac with a change of attachment, but some of the high-end translators don't work with Shark on Mac. The Shark/TC Mac file extension exchange thing also works with Vellum Cobalt, too, if anyone still works with that. Exchange between TC and Shark covers .dwg, .sat, .stp and iges.

Interestingly, the .step file is a little smaller converted with it than Don's.